PDF malware analysis — malicious · 8fe3c7f520af8d84

MALICIOUS

PDF

3.5 KB Created: 2009-03-15 12:52:54 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: 53758016944f48d96e62f448a6cdfc42 SHA-1: fc58d1146849d5cf5b1a3bfea4fda456adee946f SHA-256: 8fe3c7f520af8d8473660fff75a70aac26458c0ab0eea28e3a1147f6c0f2a197

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The presence of 'eval()' and 'String.fromCharCode' suggests obfuscated code execution. ClamAV detection as 'Pdf.Exploit.Agent-35549' confirms its malicious nature. The embedded JavaScript is likely responsible for exploiting a vulnerability within the PDF reader to download and execute a secondary payload.

Heuristics 7

ClamAV: Pdf.Exploit.Agent-35549 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35549
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_000.js` `6e269cf279cf8715231d4e29926994e6357f40bea81bc8ef6a19dfdc91293ca0`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3CE	6845 bytes
Detection ClamAV: Pdf.Exploit.Agent-35549 Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`deobfuscated.js` `6b62ce5a3a852fb70cd9d6782a03a96fae3bd69ec5558b109e03e66da43b7a94`	deobfuscated-js	PDF JavaScript deobfuscation pass	24202 bytes
Detection ClamAV: Pdf.Exploit.Agent-35549 Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s). Carved artifact contains 2 long base64-like blob(s).

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